1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2015 Nuxi, https://nuxi.nl/ 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <search.h> 32 #include <stdbool.h> 33 #include <stddef.h> 34 35 /* 36 * Thread unsafe interface: use a single process-wide hash table and 37 * forward calls to *_r() functions. 38 */ 39 40 static struct hsearch_data global_hashtable; 41 static bool global_hashtable_initialized = false; 42 43 int 44 hcreate(size_t nel) 45 { 46 47 return (1); 48 } 49 50 void 51 hdestroy(void) 52 { 53 54 /* Destroy global hash table if present. */ 55 if (global_hashtable_initialized) { 56 hdestroy_r(&global_hashtable); 57 global_hashtable_initialized = false; 58 } 59 } 60 61 ENTRY * 62 hsearch(ENTRY item, ACTION action) 63 { 64 ENTRY *retval; 65 66 /* Create global hash table if needed. */ 67 if (!global_hashtable_initialized) { 68 if (hcreate_r(0, &global_hashtable) == 0) 69 return (NULL); 70 global_hashtable_initialized = true; 71 } 72 if (hsearch_r(item, action, &retval, &global_hashtable) == 0) 73 return (NULL); 74 return (retval); 75 } 76